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STABILITY
(C2.1)
a. loadings:
The requirements of C2.1 as regards loading will be met where the loads to which the building will be subjected are calculated in accordance with -
i. for dead loads and imposed loads (excluding roof loads), BS6399: Part 1: 1996;
ii. for imposed roof loads, BS6399: Part 3: 1988;
iii. for wind loads -
A. BS6399: Part 2: 1997, or
B CP 3: Chapter V :Part 2: 1972 (in no case shall S3 be taken as less than 1);
iv. for loading of any building for agriculture, BS5502: Part 22: 1993;
v. any greater load to which the building is likely to be subjected.
b. construction:
The requirements of C2.1 as regards design and construction will be met where the work is carried out in accordance with -
i. for foundations, BS 8004: 1986;
ii. for structural work of reinforced, prestressed or plain concrete, BS 8110: Part 1: 1997, BS8110: Part 2 and Part 3: 1985;
iii. for structural work of steel -
A. BS449: Part 2: 1969, or
B. BS 5950: Part 1: 1990, BS5950: Part 2: 1992, BS5950: Part 5: 1987, BS5950: Part 6: 1995, BS5950: Part 7: 1992, BS5950: Part 8: 1990;
iv. for structural work of composite steel and concrete construction, Section 3.1 of BS5950: Part 3:1990, and BS 5950: Part 4: 1994;
v. for structural work of aluminium, BS8118: Parts 1 and 2: 1991; for the purpose of section 7.2 of Part 1 of that code, the structure must be classified as a safe-life structure;
vi. for structural work of masonry, BS5628: Part 1: 1992, BS 5628: Part 2: 1995, and BS5628: Part 3: 1985;
vii. for structural work of timber, BS5268: Part 2: 1996, BS5268: Part 3: 1998, and section 6:1 of BS5268: Part 6: 1996;
viii. for structural design of low rise buildings, BS8103: Part 1: 1995, BS8103: Part 2: 1996, BS8103: Part 3: 1996, and BS8103: Part 4: 1995; or
c. small buildings:
Where a building is -
i. of purpose group 1 and not more than 3 storeys; or
ii. an annex, of not more than 3 metres high, to a building of purpose group 1, including a garage or outbuilding; or
iii. a single storey, non- residential building of any other purpose group,
the requirements of C2.1 will be met by a structure constructed in accordance with the ‘Small Buildings Guide’ (1994 Edition) published by The Stationery Office.
DISPROPORTIONATE COLLAPSE
(C3.1) The requirements of C3.1 will be met where the structure of the building, having five or more storeys, is constructed, taking into account the recommendations on ties and on the effect of misuse or accident, in accordance with -
a. for structural work of reinforced, prestressed or plain concrete, BS8110: Part 1: 1997 and BS8110: Part 2: 1985; or
b. for structural work of steel, BS5950: Part 1: 1990 (the accidental loading referred to in clause 2.4.5.5 shall be chosen having particular regard to the importance of the key elements and the consequences of failure, and the key element shall always be capable of withstanding a load of at least 34 kn/m2 applied from any direction); or
c. for structural work of masonry, BS5628: Part 1: 1992, and BS5628 Part 2: 1995.
Note:
When applying the recommendations given in the British Standards mentioned in C3.1 a, b, and c above the area of the structure at risk of collapse within the storey and within the immediate adjacent storeys must be restricted to the lesser of -
i. 70 square metres of each of, the storey, the adjoining storey above and adjoining storey below, or
ii. 15% of the area of each of, the storey, the adjoining storey above and adjoining storey below.
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